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Part of the B complex group, found primarily in dairy produce, eggs and meat
(3) Heffernan MA, Thorburn AW, Fam B, Summers R, Conway-Campbell B, Waters MJ, Ng FM
Safety across the full program was consistently favorable: adverse events, primarily mild headache and gastrointestinal symptoms, occurred at rates comparable to placebo, with no treatment-related discontinuations, no IGF-1 elevation, and no impact on glucose metabolism
The honest answer is that it depends, and it depends most on whether you are actually deficient
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